定时器准确定时八位时钟

/*
                             定时器准确定时八位时钟
*/
#include <reg51.h>
#include <stdio.h>
#define uchar unsigned char
#define uint unsigned int
uchar code duanca[10]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
uchar code weica[8] = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
int i,j,z;

sbit LED = P1^0;
uint hour = 23,minute = 59,second = 50,t50ms = 0;//所有参数从零开始
//含参数延时
void delays(int d)
{
   while(d--);
}
//定时器0
void kinson()
{
    TMOD = 0x09;
    TH0 = 0x3C;
    TL0 = 0x0B0;
    EA = 1;
    ET0 = 1;
    TR0 = 1;
   }
   //主函数
void main(void)
 { 
     kinson();
     LED = 0;
     while(1)//大循环
     {
    for(i = 0;i<= 7;i++)//for循环
    {  
       P3 = ~weica[i];//以此选择数码管显示，一个循环一次
       switch(i)//switch开关 i = 0 1 2 3 4 5 6 7
       { 
                             //时，分，秒，分别看作一个两位数，在通过这个两位数分别除以10和取余10，得到十位和各位
          case 0:P2 = duanca[hour/10];break;//读取选择十位    
          case 1:P2 = duanca[hour%10];break;//读取选择个位
          case 2:P2 = ~0xbf;break;//显示那个横杠
          case 3:P2 = duanca[minute/10];break;//同理
          case 4:P2 = duanca[minute%10];break;
          case 5:P2 = ~0xbf;break;
          case 6:P2 = duanca[second/10];break;
          case 7:P2 = duanca[second%10];break;
          default:break;     
          }
       delays(30);
       
       }
    }
 }
 
 //中断
 void kinson1() interrupt 1
 {
      j++;
    if(j == 13)
    {
       j = 0;
       LED = ~LED;
       delays(1000); 
           //这里是的秒分时分别进一，59秒后分就进一，59分后时就进一，23时后重新循环
        second++;
        if(second == 60)
        {
           second = 0;
           minute++;
           if(minute==60)
           {
              minute = 0;
              hour++;
              if(hour==24)
             hour = 0;
       }
    }   
 } 
 }